EOTech is part of L-3 Communications, the sixth largest defense company in the United States. L-3 Communications is a leader and prime defense contractor in Intelligence, Surveillance and Reconnaissance (ISR), secure communications, government services, training and simulation and aircraft modernization and maintenance. L-3 EOTech invented, designed, and manufactures the Holographic Weapon Sight (HWS) the world's first holographic sighting system for small and medium-sized weapon platforms. Shop EOTech holographic weapon sights and gun sights at Chief Supply.